钾肥对藜麦生长及养分吸收的影响

Effects of K Fertilizer on Growth and Nutrient Absorption of Quinoa

通过盆栽试验,探究不同钾肥用量对藜麦生长及养分吸收的影响。研究在氮、磷肥用量相同时,钾肥(K_2O)用量分别为0、21、42、63、84 kg/hm~2时,藜麦株高、茎粗、生物量以及氮、磷、钾累积吸收量的变化。结果表明,施用钾肥能明显增加藜麦株高、茎粗。在藜麦整个生长期内,钾肥用量在0~63 kg/hm~2时,藜麦生物量和氮、磷、钾累积吸收量均随着钾肥用量的增加而增加;当钾肥用量>63 kg/hm~2时,生物量和氮、磷、钾累积吸收量下降;当钾肥用量为63 kg/hm~2时,生物量和氮、磷、钾累积吸收量均达最大,氮、磷、钾累积吸收量最大值分别为28.0、2.3、47.2 g/株。本试验条件下,藜麦生长适宜的钾肥(K_2O)用量为63 kg/hm~2。

The effects of different K fertilizer rates on growth and nutrient absorption of quinoa were studied by using pot experiment.The changes of plant height,stem diameter,biomass were measured and cumulative absorption of nitrogen,phosphorus and potassium were analyzed.K fertilizer was applied at 5 levels(0,21,42,63,84 kg/hm2)and the N and P rates were the same.The results showed that the plant height and stem diameter could be significantly increased by applying K fertilize rates in the growth period of quinoa,the biomass and accumulation of N,P and K of quinoa increased with the increasing of K fertilizer rates within 0-63 kg/hm2,these decreased when the K amount was above 63 kg/hm2,the biomass and accumulation of N,P and K of quinoa were the highest value at 63 kg/hm2 of K fertilizer amount.The maximum cumulative of N,P and K were 28.0,2.3,47.2 g/plant,respectively.Above all,63 kg/hm2 was the suitable application rate of K for the growth of quinoa in this research.